chicago riverboat tours

This is a random question but wondered if anyone had any information on the architectural riverboat tours in Chicago? Many people have told me it is a wonderful and interesting thing to do when in Chicago and now that we are going and I looked it up I see that there are so many to choose from. So just wondered if anyone has been on one and if there is one that is the most recommended? There is a tour through the architectural society and maybe that is the one always mentioned??? Just asking for any input....thanks!!!! Susie